Today I Learned

The adelay filter of FFmpeg does NOT explicitly set the timestamp of the frame. It starts from AV_NOPTS_VALUE, the smallest number representable. Should use asetpts after adelay to overcome this.

Github has its own npm registry, and it is possible to fetch from multiple package repositories by configuring the .npmrc.

The Streams API is even more powerful than it looks. It not only handles backpressure and queueing but also propagates abort and close actions upwards. Transform streams can also define a flush step before closing.